Arm backend: Improve noop handling

[AdrianLundell]

• Removes the identity node_visitor in favour of handling all noops in the remove_noop_pass
• Adds detach_copy to the partitioner is_noop check to avoid partitioning graphs with single detach_copy ops
• Make noop check functions in the partitioner private and remove public documentation.

Instead handle alias_copy similar to other noops

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

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❌ 10 New Failures

As of commit d0be717 with merge base 02fe862 ():

NEW FAILURES - The following jobs have failed:

• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 1
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 6c6671db153b2fb474f2061578d74e61508f90687c900d4c6d6c027621d2b89b /exec failed with exit code 1
• pull / test-samsung-quantmodels-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 3603610f4ee2eb262ad0391f99f0031fc5f1e9919855857952322b6522922b71 /exec failed with exit code 1
• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t b46e867955faacd6b833cb33341fc29499e1da75a5c5ccc929fdba22382fc91f /exec failed with exit code 1
• pull / unittest / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 4de9682f5379c879d22b2bdf0cf117a8e88af5a68a889e666cb287d9169e7da7 /exec failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_mv3_model
• trunk / test-arm-backend-ethos-u (test_pytest_models_ethos_u85) / linux-job (gh)
  RuntimeError: Command docker exec -t 8bcdd0747111d5402dd09756cb89dcc1faf1586b13f37d2b3473d26ce87c89fa /exec failed with exit code 1
• trunk / unittest-release / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 4ba7481f55683ad8cc2ad43c5c0bfb922b4aee0c3e960a4ede1d49c27bffecc1 /exec failed with exit code 1
• trunk / unittest-release / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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